Cloud resilience, provisioning

Cloud Resiliency &
cloud provisioning
By Dr. Mohammad Zunnun Khan

Resiliency
 Resilient computing is a form of failover that distributes redundant
implementations of IT resources across physical locations.
 IT resources can be pre-configured so that if one becomes deficient,
processing is automatically handed over to another redundant
implementation.
 Within cloud computing, the characteristic of resiliency can refer to
redundant IT resources
 within the same cloud (but in different physical locations)
 or across multiple clouds.
 Cloud consumers can increase both the reliability and availability of their
applications by leveraging the resiliency of cloud-based IT resources

The reality of cloud resilience
 When it comes to resilience, most organizations find these questions difficult
to answer for their legacy environments:
 Can you reliably quantify the cost of an hour of downtime?
 Can you provide accurately tested evidence to show how quickly you can resume
business operations?
 Do you know where your data corruption concentrations of risk reside?
 Do you know the extent of the impact should something happen?

The right approach to cloud resiliency
 The reality of cloud resiliency is that if you don’t design, implement and maintain it, you
don’t get it. But how does an organization ensure they get it right from the beginning? Best
practices suggest doing it right takes a structured approach that lets organizations:
 Understand the criticality of business services supported by target cloud workloads, associated
business and IT resiliency requirements, and cloud/legacy application/data dependencies
 Identify related risks and required mitigation treatments
 Determine best fit cloud strategies that meet business based resilience needs
 Document linkages, interdependencies and synchronization points between cloud and legacy
environments
 Develop, implement, test and sustain corresponding business and technology resiliency plans
and procedures
 Create cloud specific and integrated cloud or legacy resiliency validation and testing plans
 Develop resilient cloud transition roadmap

The four steps of the IBM Resilient
Enterprise Blueprint methodology
 Step 1 – Assess and Evaluate
 Collecting key business resilience requirements for target cloud workloads
 Profiling existing application chains with associated infrastructure
components and data, governing policies, resilience strategies and plans.
 Assessing target cloud workloads in terms of resilience requirements and
capabilities
 Documenting linkages, interdependencies and processing/data
synchronization points between applications workloads running on cloud or
legacy IT environments

 Step 2 – Plan and Design
 Identifying in-scope resiliency requirements for cloud and workload affinity groups and
integrated cloud/legacy application dependency groups
 Understanding the impact of provisioning lead times on recovery time and recovery point
objectives
 Applying cloud resiliency guiding principles in the design of the architecture and delivery model
 Rationalizing legacy and cloud hybrid resiliency strategies to determine best fit to meet
resilience needs
 Developing resilient strategy and resilient architecture design

 Step 3 – Implement and Test
 Provisioning target resilience environment using methods and tools to automate virtual or
physical servers for continuity and configure the cloud workload for resilience testing
 Creating cloud specific and integrated cloud or legacy resiliency validation and testing plan
(may include regular introduction of planned failures to test real time component/ service
resiliency)
 Testing the cloud resilience strategy and gaining customer acceptance
 Retaining evidence of test scope and outcomes for audit and reporting purpose

 Step 4 – Manage and Sustain
 Designing/updating resilience program framework, monitoring, governance and resiliency risk
reporting to include cloud
 Developing resilient cloud transition roadmap
 Developing cloud specific education for IT/Cloud resilience stakeholders
 Transitioning to steady state integrated resilience program management and reporting
 Maintaining appropriate checks and balances for: –
 Assurance (including third-party) and attestation
 Application readiness
 Process readiness, vendor stability and reputation, mobility to migrate to another location/vendor
 Continuity requirements
 Network
 Data
 location, protection, segregation
 Governance, risk and compliance (GRC)

Cloud Provisioning
 Cloud provisioning is the allocation of a cloud provider's resources and
services to a customer.
 Cloud provisioning is a key feature of the cloud computing model, relating to
how a customer procures cloud services and resources from a cloud provider.
 The growing catalog of cloud services that customers can provision includes
infrastructure as a service (IaaS), software as a service (SaaS) and platform as
a service (PaaS) in public or private cloud environments.

Types of cloud provisioning
 The cloud provisioning process can be conducted using one of three delivery
models.
 Each delivery model differs depending on the kinds of resources or services an
organization purchases, how and when the cloud provider delivers those
resources or services, and how the customer pays for them.
 The three models are advanced provisioning, dynamic provisioning and user
self-provisioning.

 With advanced provisioning, the customer signs a formal contract of service
with the cloud provider.
 The provider then prepares the agreed-upon resources or services for the
customer and delivers them.
 The customer is charged a flat fee or is billed on a monthly basis.

 With dynamic provisioning, cloud resources are deployed flexibly to match a
customer's fluctuating demands.
 Cloud deployments typically scale up to accommodate spikes in usage and
scale down when demands decrease.
 The customer is billed on a pay-per-use basis.
 When dynamic provisioning is used to create a hybrid cloud environment, it is
sometimes referred to as cloud bursting.

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